Function discard_query_text

src/bin/psql/command.c:3009–3023

* Discard any query text absorbed during an inactive conditional branch. * * We must discard data that was appended to query_buf during an inactive * \if branch. We don't have to do anything there if there's no query_buf. * * Also, reset the lexer state to the same paren depth there was before. * (The rest of its state doesn't need attention, since we could not be * inside a comment or lit

 * inside a comment or literal or partial token.)
 */
static void
discard_query_text(PsqlScanState scan_state, ConditionalStack cstack,
				   PQExpBuffer query_buf)
{
	if (query_buf)
	{
		int			new_len = conditional_stack_get_query_len(cstack);

		Assert(new_len >= 0 && new_len <= query_buf->len);
		query_buf->len = new_len;
		query_buf->data[new_len] = '\0';
	}
	psql_scan_set_paren_depth(scan_state,
							  conditional_stack_get_paren_depth(cstack));
}

/*
 * If query_buf is empty, copy previous_buf into it.